Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/kernel/panic.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | */ |
| 6 | |
| 7 | /* |
| 8 | * This function is used through-out the kernel (including mm and fs) |
| 9 | * to indicate a major problem. |
| 10 | */ |
| 11 | #include <linux/config.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/sched.h> |
| 14 | #include <linux/delay.h> |
| 15 | #include <linux/reboot.h> |
| 16 | #include <linux/notifier.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/sysrq.h> |
| 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/nmi.h> |
| 21 | |
| 22 | int panic_timeout; |
| 23 | int panic_on_oops; |
| 24 | int tainted; |
| 25 | |
| 26 | EXPORT_SYMBOL(panic_timeout); |
| 27 | |
| 28 | struct notifier_block *panic_notifier_list; |
| 29 | |
| 30 | EXPORT_SYMBOL(panic_notifier_list); |
| 31 | |
| 32 | static int __init panic_setup(char *str) |
| 33 | { |
| 34 | panic_timeout = simple_strtoul(str, NULL, 0); |
| 35 | return 1; |
| 36 | } |
| 37 | __setup("panic=", panic_setup); |
| 38 | |
| 39 | static long no_blink(long time) |
| 40 | { |
| 41 | return 0; |
| 42 | } |
| 43 | |
| 44 | /* Returns how long it waited in ms */ |
| 45 | long (*panic_blink)(long time); |
| 46 | EXPORT_SYMBOL(panic_blink); |
| 47 | |
| 48 | /** |
| 49 | * panic - halt the system |
| 50 | * @fmt: The text string to print |
| 51 | * |
| 52 | * Display a message, then perform cleanups. |
| 53 | * |
| 54 | * This function never returns. |
| 55 | */ |
| 56 | |
| 57 | NORET_TYPE void panic(const char * fmt, ...) |
| 58 | { |
| 59 | long i; |
| 60 | static char buf[1024]; |
| 61 | va_list args; |
| 62 | #if defined(CONFIG_ARCH_S390) |
| 63 | unsigned long caller = (unsigned long) __builtin_return_address(0); |
| 64 | #endif |
| 65 | |
| 66 | bust_spinlocks(1); |
| 67 | va_start(args, fmt); |
| 68 | vsnprintf(buf, sizeof(buf), fmt, args); |
| 69 | va_end(args); |
| 70 | printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf); |
| 71 | bust_spinlocks(0); |
| 72 | |
| 73 | #ifdef CONFIG_SMP |
| 74 | smp_send_stop(); |
| 75 | #endif |
| 76 | |
| 77 | notifier_call_chain(&panic_notifier_list, 0, buf); |
| 78 | |
| 79 | if (!panic_blink) |
| 80 | panic_blink = no_blink; |
| 81 | |
| 82 | if (panic_timeout > 0) |
| 83 | { |
| 84 | /* |
| 85 | * Delay timeout seconds before rebooting the machine. |
| 86 | * We can't use the "normal" timers since we just panicked.. |
| 87 | */ |
| 88 | printk(KERN_EMERG "Rebooting in %d seconds..",panic_timeout); |
| 89 | for (i = 0; i < panic_timeout*1000; ) { |
| 90 | touch_nmi_watchdog(); |
| 91 | i += panic_blink(i); |
| 92 | mdelay(1); |
| 93 | i++; |
| 94 | } |
| 95 | /* |
| 96 | * Should we run the reboot notifier. For the moment Im |
| 97 | * choosing not too. It might crash, be corrupt or do |
| 98 | * more harm than good for other reasons. |
| 99 | */ |
| 100 | machine_restart(NULL); |
| 101 | } |
| 102 | #ifdef __sparc__ |
| 103 | { |
| 104 | extern int stop_a_enabled; |
Tom 'spot' Callaway | a271c24 | 2005-04-24 20:38:02 -0700 | [diff] [blame] | 105 | /* Make sure the user can actually press Stop-A (L1-A) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | stop_a_enabled = 1; |
Tom 'spot' Callaway | a271c24 | 2005-04-24 20:38:02 -0700 | [diff] [blame] | 107 | printk(KERN_EMERG "Press Stop-A (L1-A) to return to the boot prom\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | } |
| 109 | #endif |
| 110 | #if defined(CONFIG_ARCH_S390) |
| 111 | disabled_wait(caller); |
| 112 | #endif |
| 113 | local_irq_enable(); |
| 114 | for (i = 0;;) { |
| 115 | i += panic_blink(i); |
| 116 | mdelay(1); |
| 117 | i++; |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | EXPORT_SYMBOL(panic); |
| 122 | |
| 123 | /** |
| 124 | * print_tainted - return a string to represent the kernel taint state. |
| 125 | * |
| 126 | * 'P' - Proprietary module has been loaded. |
| 127 | * 'F' - Module has been forcibly loaded. |
| 128 | * 'S' - SMP with CPUs not designed for SMP. |
| 129 | * 'R' - User forced a module unload. |
| 130 | * 'M' - Machine had a machine check experience. |
| 131 | * 'B' - System has hit bad_page. |
| 132 | * |
| 133 | * The string is overwritten by the next call to print_taint(). |
| 134 | */ |
| 135 | |
| 136 | const char *print_tainted(void) |
| 137 | { |
| 138 | static char buf[20]; |
| 139 | if (tainted) { |
| 140 | snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c", |
| 141 | tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G', |
| 142 | tainted & TAINT_FORCED_MODULE ? 'F' : ' ', |
| 143 | tainted & TAINT_UNSAFE_SMP ? 'S' : ' ', |
| 144 | tainted & TAINT_FORCED_RMMOD ? 'R' : ' ', |
| 145 | tainted & TAINT_MACHINE_CHECK ? 'M' : ' ', |
| 146 | tainted & TAINT_BAD_PAGE ? 'B' : ' '); |
| 147 | } |
| 148 | else |
| 149 | snprintf(buf, sizeof(buf), "Not tainted"); |
| 150 | return(buf); |
| 151 | } |
| 152 | |
| 153 | void add_taint(unsigned flag) |
| 154 | { |
| 155 | tainted |= flag; |
| 156 | } |
| 157 | EXPORT_SYMBOL(add_taint); |